Crosstalk In Optical Networks Research Articles

Calculation of bit-error rates and power penalties due to incoherent crosstalk in optical networks using Taylor series expansions

A new calculation method is presented for bit-error rates and power penalties due to incoherent crosstalk from up to eight interferers of different powers, based on a truncated Taylor series approximation of the crosstalk contribution to the noise probability density function. Formulae are provided for bit-error rates and power penalties in both thermal and ASE limited systems, with average-power and optimized decision thresholds, and include extinction ratio effects. The technique forms an excellent complement to the Gaussian approximation.

Inclusive modeling tool for homodyne crosstalk in optical networks

Coherent homodyne crosstalk in optical systems is examined. A general approach is introduced to theoretically model the crosstalk of single and multiple interferers in DFB and FP laser systems with a finite modulation extinction ratio, with PIN and APD receivers, in external modulation systems. The theoretical results of this model are verified experimentally and are compared with other theoretical models. In addition, the trade off between modulation extinction ratio and crosstalk tolerance is investigated and optimized. The general mathematical model is implemented in a computer simulator program, creating an inclusive and pragmatic engineering tool. This computer simulator dramatically improves the design of next generation crossconnects, switched and routers.

On the distribution and performance implications of filtered interferometric crosstalk in optical WDM networks

The distribution and performance implications of filtered interferometric crosstalk in optical networks is theoretically and experimentally studied. The probability density function is estimated by using a maximum entropy approach based on analytically derived statistical moments. The theoretical results are confirmed by relevant experimental data obtained from an amplitude shift keying direct detection (ASK/DD) system using directly, and externally modulated light sources. Power penalties are measured for both types of source modulation. The experimental results are in good agreement with theory.

Analysis of homodyne crosstalk in optical networks using Gram-Charlier series

Homodyne crosstalk with the same wavelength as the signal causes severe system performance degradation in optical networks by beating with the desired signal. Gaussian approximation is found to overestimate the system degradation. A correction to Gaussian approximation, Gram-Charlier series is used to analyze homodyne crosstalk. Both bit error rate (BER) and power penalty are calculated for multiple homodyne interferers.